Carrying the blood of Celestial ancestory, an Aasimar is usually good-aligned and fights against evil in the world. Aasimar are blessed with insight and personal magnetism. Most Aasimar have a few minor physical traits suggesting their heritage, such as silver hair, golden eyes, pale skin, or an unnaturally intense stare. Those descended from a celestial minion of a deity often carry a birthmark in the shape of the deity's holy symbol or some other mark significant to that faith.

[Source: Forgotten Realms Campaign Setting by Greenwood, Reynolds, Williams, and Heinsoo, published by Wizards of the Coast, page 18.]